[SOLVED] Issues Migrating to BTRFS Subvolumes | Arch Linux Community | Page 1

forest thunder Jul 12, 2025, 7:42 PM

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hi i have btrfs filesystem brcause i wanted to make snapshots of my system files im case updates break things and i can do quick rollbacks.

im im the process of moving most things from / to /@ , and from /home to /@home (so two new subvolumes). this is because i want separate snapshots of these

i make subvols
i copy all appropriate files from / to /@
copy all files from /home to /@home
i edit my /etc/fstab to have these new mounts.
with / mounting /@ after fstab edit and reboot , i reinstalled grub in my EFI partition hoping that it uses my /@boot/grub/grub.cfg
i make new boot entry for new grub and remove old one
i set as priority in uefi settings and it boot
but i get this error

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here is fstab:

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here is /etc/default/grub:

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fierce socket Jul 12, 2025, 7:49 PM

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can you show me the contents of

ls -l /mnt/boot

outside of chroot

forest thunder Jul 12, 2025, 7:51 PM

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and here is where my grub is grabbing its cfg i think

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also my kernel is old , but i wanted to not update until i made a snapshot of it working

fierce socket Jul 12, 2025, 7:53 PM

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ls -lh sorry

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-h human readable

forest thunder Jul 12, 2025, 7:53 PM

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fierce socket Jul 12, 2025, 7:55 PM

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soo unrelated but mounting your esp to /boot/efi is not recommended

i would recommend regenerating those images with a:

pacman -S linux

while in:

arch-chroot /mnt

forest thunder Jul 12, 2025, 7:56 PM

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fierce socket soo unrelated but mounting your esp to /boot/efi is not recommended i would rec...

gotcha , should i change the mount afterwards or should i do that first ?

fierce socket Jul 12, 2025, 7:57 PM

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move /boot/efi/EFI to /boot
remount esp to /boot
regen fstab

and then regenerate your kernel images

and give /etc/fstab a sanity check afterwards

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remove the /boot/efi directory as well after moving EFI out of it

forest thunder Jul 12, 2025, 7:59 PM

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when i regenerate my kernel images after mounting esp to /boot , will it make them inside the esp partition ?

fierce socket Jul 12, 2025, 7:59 PM

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kernel images are always generated in /boot regardless of where your esp partition is

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also for the fstab use uuids exclusively instead of manually specifying partitions

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genfstab -U

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forest thunder Jul 12, 2025, 8:06 PM

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fierce socket remove the /boot/efi directory as well after moving EFI out of it

uh did i do this right so far ?

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fierce socket Jul 12, 2025, 8:06 PM

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did it get mounted? lsblk -f

forest thunder Jul 12, 2025, 8:07 PM

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yeah

fierce socket Jul 12, 2025, 8:08 PM

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idk what u did but it got nuked

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also

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unmount that

forest thunder Jul 12, 2025, 8:09 PM

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forest thunder

i just did this , moved EFI to /mnt/boot before mounting esp onto it

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unmounted esp from /boot/efi

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then mounted to /boot which had EFI moved there

fierce socket Jul 12, 2025, 8:10 PM

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fierce socket

arch-chroot /mnt
grub-install --efi-directory=/boot
pacman -S linux amd-ucode
grub-mkconfig -o /boot/grub/grub.cfg
genfstab -U / > /etc/fstab

fierce socket Jul 12, 2025, 8:10 PM

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fierce socket arch-chroot /mnt grub-install --efi-directory=/boot pacman -S linux amd-ucode gr...

just do these

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esp is not that important

forest thunder Jul 12, 2025, 8:10 PM

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okiedokie

fierce socket Jul 12, 2025, 8:11 PM

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fierce socket esp is not that important

(easily remakeable if it gets nuked)

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run grub-mkconfig after reinstalling the microcode and kernel

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i edited it

forest thunder Jul 12, 2025, 8:16 PM

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alright

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had to exit chroot for a sec to use genfstab

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fierce socket Jul 12, 2025, 8:17 PM

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it's included in the arch-install-scripts package

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by the way

forest thunder Jul 12, 2025, 8:18 PM

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i see

fierce socket Jul 12, 2025, 8:18 PM

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for sanity check:

ls -lh /boot
cat /etc/fstab

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oh and:

efibootmgr

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to see if grub is in there

fierce socket Jul 12, 2025, 8:18 PM

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forest thunder

you forgot to grub-mkconfig

forest thunder Jul 12, 2025, 8:19 PM

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fierce socket you forgot to grub-mkconfig

i did after that ss and then regen fstab again , just took that ss before i saw ur edit

fierce socket Jul 12, 2025, 8:19 PM

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kay

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do the sanity checks

forest thunder Jul 12, 2025, 8:19 PM

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fierce socket for sanity check: ls -lh /boot cat /etc/fstab

fierce socket Jul 12, 2025, 8:20 PM

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lgtm

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reboot and see

forest thunder Jul 12, 2025, 8:20 PM

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arch is 0003

fierce socket Jul 12, 2025, 8:20 PM

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yop yop

forest thunder Jul 12, 2025, 8:20 PM

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alrighty

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also i got this while updating

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missing kernel header for nvidia

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it just booted into my windows instead :/ gonna enter uefi settings

fierce socket Jul 12, 2025, 8:22 PM

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forest thunder

pacman -S linux-headers

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3 was first to boot though

forest thunder Jul 12, 2025, 8:23 PM

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fierce socket 3 was first to boot though

yeah idk why i think my
bios is funny

fierce socket Jul 12, 2025, 8:23 PM

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which uefi?

forest thunder Jul 12, 2025, 8:23 PM

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in the setting it shows arch after windows for BBS priority

fierce socket Jul 12, 2025, 8:23 PM

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i mean mobo

fierce socket Jul 12, 2025, 8:24 PM

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forest thunder in the setting it shows arch after windows for BBS priority

emoji_199

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so weird

forest thunder Jul 12, 2025, 8:24 PM

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uhhhh i forgot the name i think it was called something like asrock pro 5 or something

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fierce socket Jul 12, 2025, 8:25 PM

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forest thunder

oh msi

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msi is funky

forest thunder Jul 12, 2025, 8:25 PM

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last time i couldnt find this setting for "uefi hard disk bbs priorities" and just kept lookimg in "boot priorities"

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and couldnt boot from grub for a ehile

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anyways rebooting

fierce socket Jul 12, 2025, 8:27 PM

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worked?

forest thunder Jul 12, 2025, 8:27 PM

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seems like it worked

fierce socket Jul 12, 2025, 8:27 PM

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... solved

sly ledgeBOT Jul 12, 2025, 8:27 PM

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fierce socket Jul 12, 2025, 8:27 PM

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do this then

forest thunder Jul 12, 2025, 8:27 PM

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[SOLVED] Issues Migrating to BTRFS Subvolumes

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how u so pro

fierce socket Jul 12, 2025, 8:28 PM

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forest thunder how u so pro

secret

forest thunder Jul 12, 2025, 8:28 PM

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uh now i need to fix nvidia stuff lol

fierce socket Jul 12, 2025, 8:29 PM

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fierce socket pacman -S linux-headers

this

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then rebuild the kernel

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pacman -S linux

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reboot after

forest thunder Jul 12, 2025, 8:32 PM

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alrighty loading

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i hope to one day attain your skill levels

#[SOLVED] Issues Migrating to BTRFS Subvolumes